Hi Lars,
your little hint concerning glow was the final push I needed to crack the nut. It turned out to be even easier than I expected. Here is my material specification (glow, modified by colorfunc, which calls a normalshader.cal function file that I wrote, listed further down):
···
----------------------------------------------------------------
# Materials
void glow normalglow
0
4 1.0 1.0 1.0 -1
normalglow colorfunc normalshadermaterial
4 red green blue normalshader.cal
0
------------------------------------------
The normalshader.cal looks like this (thanks to Greg for making function files so easy to use and versatile):
{
normalshader.cal
Look in RADIANCE/lib/rayinit.cal for more info on builtin funcs and vars
}
red = (Nx + 1)/2;
green = (Ny + 1)/2;
blue = (Nz + 1)/2;
-------------------------------------------------------------------------
A example normal map is attached. It looks a little ugly because it is a triangle mesh constructed from a stereo camera scan of an outdoor scene (color image attached, too).
Best,
Claus
Lars O. Grobe wrote:
Hi!
I wish to use Radiance to render a normal map of a scene. By normal map
I mean a floating point RGB image, where the RGB values of each pixel
correspond to the xyz coordinates of the surface normal in scene
coordinates. More precisely, for example for the red channel:R = (Nx + 1)/2
I think I'd use rtace with -oN, pipe the result to rtrace to calculate your channel value, and convert the output into a radiance hdr format using pvalue.
I guess that, if you want to do all this with rpict and render the surfaces "in your scene", you could try the glow modifier as a material to modify. Just as a starting point.
CU Lars.
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